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Mathematics Senior High

赤く丸をしたbの問題で解答の方に二階微分した後の式がなぜ(-1/4)(-1/4)(H-27)になるのか分かりません。教えてください🙇‍♀️

QA At time t = 0, a boiled potato is taken from a pot on a stove and left to cool in a kitchen. The internal temperature of the potato is 91 degrees Celsius (°C) at time t = 0, and the internal temperature of the potato is greater than 27°C for all times t > 0. The internal temperature of the potato at time t minutes can be modeled by the function H that satisfies the differential equation dH (H- (H-27), where H(t) is dt measured in degrees Celsius and H(0) = 91. (a) Write an equation for the line tangent to the graph of Hat t = 0. Use this equation to approximate the internal temperature of the potato at time t = 3. (b) Use 2017 APⓇ CALCULUS AB FREE-RESPONSE QUESTIONS (a) dH d²H dt² to determine whether your answer in part (a) is an underestimate or an overestimate of the internal temperature of the potato at time t = 3. (c) For t < 10, an alternate model for the internal temperature of the potato at time 7 minutes is the function -= − (G - 27)²/3, where G(t) is measured in degrees Celsius dG G that satisfies the differential equation dt and G(0) = 91. Find an expression for G(t). Based on this model, what is the internal temperature of the potato at time t = 3 ? 564 at (21-27) - == 2-16 To = - = (H(3)-27) 4 -64 = HB)-27 -37 = H (3) (b) _d²fi © 2017 The College Board. Visit the College Board on the Web: www.collegeboard.org. GO ON TO THE NEXT P

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English Senior High

答え教えてください☺︎♪

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English Senior High

my way2lesson9のQ&Aの1.2.3の答えが分かりません。どなたか教えて頂きたいです

15 Section 1 ●チャップリンは、どのような幼少時代を送ったのでしょうか。 ・チャールズ・チャップリンは有名な俳優で、プロデューサーでした。 彼は人類 MEL created many films about humanity, peace, and equality. 彼は喜屋 He was called the King of Comedy". Before he becamg/ なる前 famous, However, his Slife was quite tragic. 1887年10 チャップリ 5 Chaplin was 2人とも保存でis father both actors. でつまれました。彼の 親は .horn in London in 1889. His parents were Foreft Q&A ものでした。 家族をはなれました。彼の母、そして彼自身にとっ the family when Charlie was only one year old. For his mother, brother, and himself, 人生は簡単ではありませんでした。 彼女は精神病にくるしみ始めました。 to suffer from illness. けっきょくまャーリーはまずしい子ども Eventually, Charlie was Sent to a 達のための 送られました。 ◎こどくや house for poor children. Feeling lonely and miserable, he spent most of his childhood there. 金を稼ぐ She began When Chaplin 彼の母が病気になり チャップリンが5歳の時。 was five years old, his mother fell ill I and lost her job. Send to work very hard to 働きましたが 十分なmake enough money. living, but she could not Charles Chaplin 幼少時代のチャップリン (中央) 1. Did Chaplin create films only about equality? 2. How was his family's life? 3. Who began to suffer from mental illness? producer [pradjan film(s) (p.123) Charles Chaplin チャールズ・チャップリン (1889~1977) 6 Charlie チャーリー 《Charles の愛称》 10-11 make a living 生計を立てる 9 fall ill 病気になる 11 make money 金を稼ぐ bumanity [hju:man るため to makeはじめに a ・できませんでした。 king ki comedy [kúmədi] ◆Charlie (tfa:rli] mental [ eventual [ivèntjuali] lonely misera [mizrabl 3 the King of Cor

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Chemistry Senior High

どうして[H₂O₂]は2乗にならないのですか?

10 5 (60)式と(62)式のように,反応物の濃度と反応速度の関係を表した式 を 反応速度式または速度式という。このとき,比例定数k, k′は rate equation 速度定数とよばれ,反応の種類が同じで、温度が一定ならば一定の値 rate constant となる。温度を変えたり,触媒を加えたりした場合には,速度定数の値 は変化する。 反応速度式は化学反応式の係数から単純に決まるようなものではなく, 実験によって求められるものである。 例えば, (58) 式の反応速度”は, 実験によって (63) 式のように表せることがわかっている。 ●参考 2H2O2 2H2O + O2 v" =k" [H2O2](k" は比例定数) -2乗ではない 問 14 A + 2B Cの反応がある。 Aの濃度だけを0.5倍にすると, 反応速度 は 0.5倍になった。 Aの濃度を0.5倍に, B の濃度を 1.5倍にすると, 反応 速度は0.75倍になった。 この反応の反応速度式を示せ。 参考 反応速度式の決定 参 p.145の と濃度を算出した。 ここで,平均の反応速度が平均の濃度に比例すると仮定する。 v = k c ( k は比例定数) で, 2H2O2 2H2O + O2 で表される反応の反応速度 このとき,各時間帯の についてんを求めると, その値 はほぼ一定となる (右表)。 時間 [s] 速度定数k [×10-/s] と求めることができる。 また, に対する をグラフに すると、右図のようになる。 これに したがって, 反応速度式はvk [H2O2] と決定でき, その値は 2.3 + 2.3 + 2.3 + 2.3 + 2.1 k= = 5 x 10™/s ≒ 2.3 x 10-2/s la [x1 (58) Op. 143 (63) X 1.6 1.4 1.2 10 0 30 60 90 120 150 2.3 2.3 2.3 2.3 2.1 絡

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